Going off of the information seen on our official PlayStation site (http://www.playstation.com/en-us/games/the-order-1
I think I'd be Galahad because of the Sideburns, but personality-wise, I'd be more like Isabeau due to her headstrong personality.
I feel the most connected to Sir Percival/Sebastian Malory because I'm keen on commanding and earning respect, working outside of the bounds of the law, and bending some rules to do something right.
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I think I would have to say Galahad as well. I'm a very calm and collected person, although I'm not so sure about being jaded and numb to the violence. If you lived forever, I'm sure you would grow numb to it eventually though, so that makes sense.